Open the drop-down and choose a location. As a result of your selection the appropriate area of the map will be marked.

About RadDropDownTree for ASP.NET AJAX

The RadDropDownTree control is a combination of a lightweight dropdown and a tree control.
In the RadDropDownTree we use the approach with entries.
Basically, a new entry is created as a result of node's selection from the tree.

RadDropDownTree can be bound to various data sources such as DataTable, DataSet,
Declarative DataSource types like SqlDataSource,
ObjectDataSource, XmlDataSource, Linq DataSource and Entity DataSource.

RadDropDownTree and 90+ other controls are part of UI for ASP.NET AJAX,
a comprehensive toolset taking care of the common functionality of your application,
while leaving you with more time to work on its business logic.